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<title>全选全不选</title>
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<h1>请选择你喜欢的水果</h1>
<input type="checkbox" value="apple"/>苹果
<input type="checkbox" value="banner"/>香蕉
<input type="checkbox" value="Watermelon"/>西瓜
<input type="checkbox" value="litchi"/>荔枝
<input type="checkbox" value="purple"/>葡萄
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<input type="button" value="全选" id="btn1"/><input type="button" value="全不选" id="btn2"/><input type="button" value="反选" id="btn3"/>
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